Twin-pot glass-furnace.



1.1.1 615.11101111311116. TWIN POT GLASS FURNACE. APPLICATION FILED MAY2. I9I3. 1,183,696. I Pamd`11ay16,1916

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MT1 i-l1@ i IIIIIIIIIIIIII ie I anotherV replaced When damaged WithoutT'tVIhI-PGT GLSS-FURNACE I nis-aseo,

Specification of Letters latentk.V

Application led May 2, 1913. Serial No. fa.

To' all whom t may concer Be it known that We, LINCOLN A., THORN- Bnnoand CLARA E. THORNBURG, lcitizens-ofthe United States, residing atMuncie, in the county of Delaware and State of Indiana, have invented anew and useful Twin-Pot GlassFurnace, of which the following is aspecification.

The object of our invention is to produce a twin-pot glass drawingapparatus of such character that the drawing operation may bepractically continuous? taking place from one pot while ther other isbeing drained, and the construction being such that-either pot may bereadily removed and discontinuing drawing from the other and such that aminimum amount of Waste glass will be produced.

`The accompanying drawings illustrate our invention.

' Figure l is a side elevation or an embodiment of vour invention; dig.2 a central vertical section; Fig. 3 a plan; Fig. 'Ll a detail.A of oneof the pots; and Fig. 5 a detail of a convenient valve for controllingthe dow of the air to the cover lifting cylinder.

fin the drawings i indicates a furnace or heater box divided by apartition into two chambers 12, l2. Pivoted upon a suitable pin 141-projected at each side of the furnace 10, is a beam 15 -which, at itsopposite ends, is provided with transverse bearings adapted to receiveand support stud shats 16.. The, upper part of the bearing for each studshaft 16 is convenientlyvormed in a vbearing cap 17 hinged at 18 uponthe beam i 'and normally held in place by a bolt or other suitable means19 which is readily removable in order to permit the cap 17 to be swungaway so as to permit the ready removal of the nud shaft 16 invorder tore place a damaged pot. The sides of the fur? nace areslotted, asindicated at 21 to perinit the passage of the stud shafts, and each ofsaid stud shafts at its inner end is provided with a polygonal portion22 which ts into the correspondingly-formed pocket 23 in the side of thepot 24.

The form of the pot' is quite material. From our past experience We havefound that with a practically dat bottom pot, especially a double pot ofthe form now cominonly'in use, the glass becomes so chilled, when nearlyexhausted from the pot, that 'there is a distinct tendency tomateriallycated at 24:, so that at all times 'the thichi- I Vness of theglass at the center of the pot is I materially greater than at the sidesso that.;

as the draw reaches its end the supply of lass comes from the center ofthe not instead of from the outerparts. fis a consequence We have found'that it is possible td Y draw almost the entire body of glass roin thepot. tl/le have found it also advisable to make the bottomoi the `pot ofsubstantially uniform thickness and providing the recessed lugs 23 atthe sides, in place oi integral trnnnions, We have found .it possibletomaterially lighten the pot and thus decrease the cost oi"- itsproduction and. consequently eilect a saving in pot replacement.

At its outer end each stud shaft i6 is pro* vided With a sprocket Wheel25 (or other means by which it 'may be tilted) and over each of thesesprocket Wheels is carrieda chain 26 Which,in turn, is carried over oneof a pair of sprocket Wheelsy 2?', 27 journaled upon the pini-i. Thetivo sprocket Wheels 27 27 are connected together and to a sprocketWheel 28, and running over the sprocket wheel 2X5 is a chain 29 Whichpasses over a sprocket 'Wheel 30 carried by a shaft 3l journaled insuitable brackets at one end of the furnace and provided with anoperating lever 32 carrying a detent 33 which cooperates with a suitablesegment 34; by

determined and held. The construction just described and illustrated inFig. l, is preferably duplicated upon the opposite side of the structureas indicated in Fig. 3a Eachheani lo is provided with a depending arm elto "which is connected one end of link l2 the opposite end' of saidlinlr being pivoted to an arm 43 carried by 4a shaft 44 which isjournaled in suitable brackets on the 'furnace adjacent shaft 31 andprovided With an operating lever 45 having a detent 46 which coperateswith the segment 47..

Arranged to cover the upper ends of chambers l2, l2 are cover plates i3,'said cover plates being suitably' perforated to closely surround theadjacent pot 24. Mounted at opposite ends of the furnace 10 are two aircylinders 50, 50 each of which is provided with a piston and pistonstem51 adapted to engage the adjacent cover plate 13. Each air cylinder isprovided with a pipe line 52 and each of these pipe lines 1s connectedto a suitable valve casing 53 into which leads an air supply line 54 andfrom which leads an exhaust passage 55, and in which a valve 5G ofordinary form is arranged for alternate supplyand exhaust of the twolines 52, 52. The valve 56 may be conveniently provided with a footlever 57 placed where it can be operated bythe operative. The covers 13,13 may be swung back far enough to give access to the subjacent pot butthe plungers 51 need only lift the covers sufficiently to give clearancefor the tilting operation of the pots. Each of the chambers 12, 12 isheated by a suitable heater, as for instance an oil burner 60, and

`.each of said chambers is preferably formed so that the glass thereinwill discharge.

through a drainage opening The shafts of the two pots are so associatedwith their driving mechanism that when one pot is in a substantiallyhorizontal glass retaining position the other pot will be suiii cientlyinverted to permit the glass if it be sufiiciently molten, to draintherefrom.

In operation one pot is brought to a glass retaining position, by aproper turning of shaft 31, and this pot is projected upwardly partiallythrough the adjacent cov-er plate by a rocking of shaf-t 44. Thereuponit is charged with molten glass and this glass is drawn therefrom in theusual manner.

When the drawing operation 4has been completed there will remain in thepot a'certain amount of glass which is generally too Stiff to drainreadily therefrom even when the pot is inverted. The operator will firstpress upon lever 57 so as to cause the appropriate plunger 51 tolift'the adjacent eoverplate so as to permit the operator' to firstswing shaft 31 so as to invert the freshly emptied pot and to revert thevother pot and at about the same time the operator, by swinging theshaft 44, will swing the beams 15 so as to present the newly revertedpot upwardly through the adjacent cover in position to receive a chargeof the molten glass, where- ,upon the drawing operation is repeated andin the meantime the inverted pot is subjected to the heat of its chamberand-,the surplus glass therein is caused to drain therefrom without theformation of chilled teats.

The heat within each chamber 12 is so regulated as to maintain theadjacent pot in proper working temperature and so as to prevent anyunnecessary chilling of the freshly. introduced glass.

The cover plates may conveniently be matie of castings and, by reason ofallowing the pot to extend through the top plate will give a surfacechill to the new charge of glass so that the drawing operation. may bebegun quickly and continued rapidly and increase production.

By the alternate use of the two pots, heatin'g and drawing from one,while draining the other, we are able to present each 'pot in suchcondition that the fresh charge is not chilled by the pot bottom andconsequently cylinders of much better quality throughout4 1. In a glasshandling apparatus, the.

combination with a furnace, of a pot-supporting beam structure,a pair ofpots horizontally journaled on opposite ends of said beam structure,driving means connected with said pots for swinging them on theirjournals, means for swinging the beam structure to raise and lower thepots, and heating means for said pots, said heating means comprising apair of hinged perforated cover plates, and means for alternatelylifting said cover plates.

2. In a glass handling apparatus, the combination with afurnace, of apot-supporting beam structure, a pair of pots horizontally journaled onopposite ends of said beam structure, driving means connected with saidpots for swinging them on their journals, and means forswinging the beamstructure to raise and lower the pots.

3. A glass drawing apparatus comprising two independently movabledrawing pots mounted in horizontally spaced relation, and means forelevating either pot and simultaneously depressing the other pot.

et. A glass drawing apparatus comprising a horizontally disposedtiltable'- support, two horizontally spaced, independently movabledrawing pots, one at each end of said support, and means for oscillatingsaid support to elevate either pot and simultaneously depress the otherpot.

5. 11 glass drawing apparatus cpniprising two independently movabledrawing pots mounted in horizontally spaced relation, means forelevating either pot and simultaneously depressing the other pot, andmeans for dumpingeach pot as it is being lowered.

6. A glass drawing apparatus comprising a horizontally disposed tiltablesupport, two

horizontally spaced drawing pots carried by said support, one at eachend thereof,

means for oscillating said support to alternately raise and lower saidpots, and means for causing the pot that is lowered to assume a, dumpingposition as the other assumes an operative position.

7. A glass drawing apparatus comprising a horizontally disposed rockshaft, a tiltable support attached to said rock shaft, independentlymovable drawing pots carried by said support in horizontally spacedrelation andlocated on opposite sides of said rock shaft, and means foroscillating said rock shaft to elevate either pot and simultaneouslydepress the other pot. y

8. A glass drawing apparatus comprising a horizontally disposed rockshaft, spaced,l apart beams attached to and movable with said rockshaft, drawing pots supported by said beams and located on oppositesides of said rock shaft, and means for oscillating said rock shaft toraise and lower said pots alternately into and out of operativeposition.

9. A glass dra-wing apparatus comprising a horizontally disposedI rockshaft, a tiltable Isupport attached to said rock shaft, pivoted drawingpots carried by said support and located on opposite sides of saidshaft, means for actuating said rock shaft to raise and lower said potsalternately into and out of position, and means for rocking said pots insaid support.

10. A glass drawing apparatus comprising a horizontally disposed rockshaft, spaced apart beams attached to and movable with said rock shaft,drawing pots supported by said beams and located on opposite sides ofthe rock shaft, means for actuating said rock shaft to raise either potand to simultaneously depress the other pot, and means for rocking saidpots in their supports. y

11. A glass drawing apparatus comprising a furnace, two spaced apartindependently pi'voted drawing pots, means for elevating either pot andsimultaneously depressing the other pot, cover plates fon each pot, andmeans for moving the cover plates to permit pivotal movement of thepots.

in witness whereof, we, have hereunto set our hands at Indianapolis,Indiana, this sixteenth day of April, A. D. one thousand nine hundredand thirteen.

his l LlNCOLN A. kTHORNBURGn CLARA E. THORNBURG.

Witnesses:

ARTHUR M. HOOD, FRANK A. FAIILE.

